#!/usr/bin/env ruby
#
#  ahnctl - Adhearsion daemon controller
#
# Adhearsion, open source collaboration framework
# Copyright (C) 2006,2007,2008 Jay Phillips
#
# This library is free software; you can redistribute it and/or
# modify it under the terms of the GNU Lesser General Public
# License as published by the Free Software Foundation; either
# version 2.1 of the License, or (at your option) any later version.
#
# This library is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# Lesser General Public License for more details.
#
# You should have received a copy of the GNU Lesser General Public
# License along with this library; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA

USAGE = "Usage: ahnctl start|stop|restart /path/to/adhearsion/app [--pid-file=/path/to/pid_file.pid]"

# Blow up if the CLI arguments are invalid
abort USAGE unless (2..3).include?(ARGV.size) && %w[start stop restart].include?(ARGV.first)

# By default, ahnctl will use the version of Adhearsion it was installed with.

pid_file    = ARGV.pop if ARGV.size == 3
ahn_command = File.expand_path File.dirname(__FILE__) + "/ahn"
app_dir     = File.expand_path ARGV.last

pid_file_path_regexp = /^--pid-file=(.+)$/
abort USAGE if pid_file && pid_file !~ pid_file_path_regexp

# If pid_file is not nil, let's extract the path specified.
pid_file &&= File.expand_path pid_file[pid_file_path_regexp,1]

# If there was no third argument and pid_file is still nil, let's use the default.
pid_file ||= app_dir + '/adhearsion.pid'

abort "Directory is not an Adhearsion application!" unless File.exists?(app_dir + "/.ahnrc")

def terminate(pid) `kill -s TERM #{pid} 2> /dev/null` end
def      kill(pid) `kill -s KILL #{pid} 2> /dev/null` end

# Even if we're starting Adhearsion, we need to make sure to clean up after any stale
# pid files. In effect, start is the same as restart.
puts "Stopping Adhearsion app at #{app_dir}" if %w[stop restart].include? ARGV.first

if File.exists?(pid_file)
  # An Adhearsion process may still be running. Let's kill the other one as cleanly as possible
  pid = File.read(pid_file).to_i

  # Time to spend waiting for Adhearsion to exit
  waiting_timeout = Time.now + 15

  terminate pid
  sleep 0.25 until `ps -p #{pid} | sed -e '1d'`.strip.empty? || Time.now > waiting_timeout
  kill pid

  `rm -f #{pid_file}`
end

if ['start', 'restart'].include? ARGV.first
  puts "Starting Adhearsion app at #{app_dir}"
  `#{ahn_command} start daemon #{app_dir} --pid-file=#{pid_file}`
end